Win7/Dell D820 not working on Dell PR01x dock and KVM

Putting together my "new" home network. I have 3 laptops (Dell Latitude D820 - Win 7 Pro, Dell Latitude D620 - Win XP Pro and Lenovo T400 - Win XP Pro). I have a Lenovo port replicator/dock and a Dell PR01x port rep/dock. I have just bought a new Rosewill RKV-2U USB KVM. With the 2 XP laptops, all works great. But if I dock my Win7 Dell D820 laptop, the video comes up but the keyboard and mouse do not - using the same port rep/dock that the Dell D620 just came off of. I noted the Rosewill KVM port light flashes while "detecting/enabling" the devices when switching to the other port and then go steady when ready to work. But with the D820/Win7 the port light continues to flash. I checked the Rosewill site and they say it's compatible with up to Vista, but doesn't say yay/nay about 7 - so my guess is it SHOULD since it works with Vista. I can't find any info from Dell about Win7 compatibility with their PR01x port rep/dock.

Dell D820 laptop is running Win7 Pro x86, 3GB RAM, BIOS A10 (latest), all drivers up to date, all software (OS, etc) up to date.

Any thoughts or ideas?

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